[hibernate-dev] Making it pluggable how GenerationType.AUTO is mapped

Hi Steve, all, For OGM it would be beneficial if there was an extension point in ORM which allows us to customize how GenerationType.AUTO is mapped. AFAICS, that's currently semi-hard coded in ORM. Depending on whether "new_generator_mappings" is set, either SEQUENCE (true) or "native" (false) will be used. Now for the MongoDB grid dialect we'd ideally do the following: If the id of an entity is declared as org.bson.typesObjectId or @Type(type = "objectid") String then map AUTO to IDENTITY (ObjectId is a MongoDB-specific type which resembles an identity column). Otherwise map it to TABLE (or SEQUENCE, which transparently falls back to TABLE). I.e. this decision would not be a global one, but depend on the specific id type. Would this be feasible to do? or is it mandated by JPA somehow that AUTO is always mapped in the same way? I cannot judge on the amount of changes required in ORM as atm. AUTO always is mapped in the same way, it doesn't depend on the specific entity and its id type. Any thoughts? Thanks, --Gunnar